BOILER AIR ELIMINATORS KEEP CLOGGING

I have a Weil McLain G06 gold series boiler for my hot water baseboard heat
system. I also have boiler anti-freeze installed in it because I have 1 zone
that has a tendency to freeze when not active. The boiler has an air purge pipe
right next to the baseboard outlet pipe, and there is also an American Air
Purger in the water output line. At those each of those 2 locations there is an
American float type air purge valve. They work well for about a year or 2, and
then the boiler anti-freeze clogs them up. The anti freeze even discolors the
outside of the float valves, turning them green. Is there any kind of air purge
valve that the anti freeze won't clog up ???
RON
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